#pragma once
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include "Log.hpp"

#define BACKLOG 5

class TcpServer
{
public:
    TcpServer(int port)
        :_port(port),
         _listen_sock(-1)
    {}

    void InitServer()
    {
        Socket();
        Bind();
        Listen();
        LOG(INFO, "tcpserver init success...");
    }

    void Socket()
    {
        _listen_sock = socket(AF_INET, SOCK_STREAM, 0);
        if (_listen_sock < 0)
        {
            LOG(FATAL, "socket error!");
            exit(1);
        }

        int opt = 1;
        setsockopt(_listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
    }

    void Bind()
    {
        struct sockaddr_in local;
        memset(&local, 0, sizeof(local));
        local.sin_addr.s_addr = INADDR_ANY;
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);

        if (bind(_listen_sock, (const sockaddr*)&local, sizeof(local)) < 0)
        {
            LOG(FATAL, "bind error!");
            exit(2);
        }
    }

    void Listen()
    {
        if (listen(_listen_sock, BACKLOG) < 0)
        {
            LOG(FATAL, "listen error!");
            exit(3);
        }
    }

    static TcpServer* GetInstance(int port)
    {
        static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
        if (_svr == nullptr)
        {
            pthread_mutex_lock(&mutex);
            if (_svr == nullptr)
            {
                _svr = new TcpServer(port);
                _svr->InitServer();
            }
            pthread_mutex_unlock(&mutex);
        }

        return _svr;
    }        

    inline int Sock()
    {
        return _listen_sock;
    }

    ~TcpServer()
    {
        if(_listen_sock >= 0)
        {
            close(_listen_sock);
        }
    }

private:
    int _port;
    int _listen_sock;
    static TcpServer* _svr;

    TcpServer(const TcpServer& x){}
};

TcpServer* TcpServer::_svr = nullptr;